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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Statement of Comprehensive Income [Abstract]        
Net income $ 1,384 $ 940 $ 3,127 $ 2,484
Other comprehensive income (loss), net of tax        
Change in fair value of derivatives, net of tax of $65, $(1), $149 and $(7), respectively (211) 3 (498) 24
Derivative amounts reclassified to net income, net of tax of $(11), $3, $(96) and $(2), respectively 35 (5) 320 6
Changes in benefit plan obligations and other, net of tax of $—, $—, $— and $—, respectively 0 0 1 1
Total other comprehensive income (loss), net of tax (176) (2) (177) 31
Comprehensive income 1,208 938 2,950 2,515
Less: Comprehensive income attributable to noncontrolling interests 34 1 37 68
Comprehensive income attributable to ONEOK $ 1,174 $ 937 $ 2,913 $ 2,447